You’re correct that subordinate clauses should be separated with commas. However, the existence of a subordinate clause implies the existence of a main clause. If you take out “without dignity or grace”, you’re left with “winning…is not winning”. Neither of those can stand alone as a main clause. Therefore, since every sentence has a clause, and since all we’re left with is “without dignity or grace”, “without dignity or grace” MUST be the main clause and thus, needs no commas. But good try.